#include <bits/stdc++.h>
#include <algorithm>
using namespace std;

int main(){
    int n;
    cin >> n;
    vector<int> a(n);
    for(int a_i = 0; a_i < n; a_i++){
       cin >> a[a_i];
    }
    // your code goes here
    sort(a.begin(),a.end());
    int minDiff = a[1] - a[0];
    for(int i = 2; i < a.size(); i++){
        minDiff = min(minDiff,a[i]-a[i-1]);
    }
    cout << minDiff;
    return 0;
}